Groundwater flow analysis with saltwater-freshwater interface and active fault in Awaji Island

Kawaguchi, Tatsuya*; Kusano, Tomohiro; Nohara, Tsuyoshi   ; Yasue, Kenichi; Kamataki, Takanobu*

In this study, the ground water analysis that assumes presence of salt water and/or high conductivity fault zone has been taken place in northern Awaji Island using numerical simulation. The author has accumulated data from the case with boundary condition and without it. The result shows that in the case of considering presence of salt water, both hydraulic total head and flux of surface flow has increased. A part of the point where large amount of discharge is shown by the analysis is corresponding to the point where spring water is confirmed by the field investigation. A part of the analytical result with continuous high conductivity zone is assumed discord with the result of the field investigation.